Calender-doctor.



T. E. WARREN.

CALENDER DOCTOR.

APPLICATION FILED JAN-30,1917.

7h 1 9 11 0 6 D H J 0 O t n w a P 2 SHEETS-SHEET I.

A TTOR/VEYS T. E. WARREN.

.CALENDER DOCTOR.

APPLICATION FILED mmo. 1917.

7 1 9 1 0 6 H H o d e t H 9 b a P 2 SHEETS-SHEET 2- lA/VE/VTOR A; A TTOR/VEVS THOMAS E. WARREN, 0F TICONDEROGA, NEW YORK.

CALENDER-DOCTOR.

Specification of Letters Patent.

Patented June 5, 1917.

Application filed January 30, 1917. Serial No. 145,377.

To all whom it may concern:

Be it known that I, THOMAS E. WARREN, a citizen of the United States, and a resident of Ticonderoga, county of Essex, State of New York, have invented certain new and useful Improvements in Calender-Doctors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to doctors for calendering machines, and more particularly to improvements in the type of doctor shown and described in my prior Patent No. 1,144,802 dated June 29, 1915.

In the above mentioned patent I have disclosed a calender mechanism designed for a stack embodying a number of rolls with a doctor for each roll and a universal control whereby all the doctors may be simultaneously shifted into and out of contact with their respective rolls. Such doctor mechanism also embodies a universal adjustment for simultaneously varying the pressure of all the doctors against their respective rolls and an individual adjustment by means of which the pressure exerted by any doctor against its roll may be individually varied.

The object of the present invention is to provide a doctor mechanism for a stack of rolls having a universal control preferably of the type illustrated in my said prior patent and also an individual control whereby any individual doctor can be quickly shifted out of engagement with its roll without interfering with the position of any other doctor. It is sometimes necessary to remove the doctors from contact with the rolls during the operation of the calendering machine for cleaning, adjustment, etc. With calendering machines ha ving the universal control for the doctors of the several rolls as heretofore constructed. this accomplished only by shifting all the doctors of to their open position; hence should there be an adherence of extraneous matter to the surface of any one of the rolls of the stack, it would produce a defect in the paper. \Vith an individual control the only possibility of damage to the paper would be the presence of extraneous matter on the single roll whose doctor required adjustment and any extraneous matter which might be transferred to the other rolls would be doctored 05 by their doctors which would be left in working position while the doctor requiring attention was unlatched.

With the improvements of this application, only the doctor requiring attention need be withdrawn from its roll, so that the possibility of a defect in the paper is limited to the possible accumulation on that particular roll.

By my improved mechanism, I also provide a construction whereby the individual doctor may be shifted into and out of position and securely held in position by the mere operation of a lever without tools of any kind and in a moments time.

As stated above, my improved doctor is especially designed for use in connection with the universal control of my prior patent. or some other suitable form of control, and when so used the shifting of the individual doctor out of contact with its roll does not affect the position or the pressure adjustment of any other doctor, and when the individual doctor is restored to position it is again subject to the exact pressure under which it was previously working. My improved doctor may, however, be used to advantage upon a single roll or with other forms of control than that shown in my prior patent.

In the accompanying drawings I have illustrated a preferred embodiment of my improved doctor in connection with a universal control such as illustrated in my prior patent, and in said drawings,

Figure 1 is an end view of a stack of rolls equipped with my improved doctor mechanism;

Fig. 2 is an end elevationof a single doctor on a larger scale; and

Fig. 3 is a. sectional detail on line 3-3 of Fig. 2.

Referring now to the drawings, particularly to Fig. 1, 1 indicates the frame of the calender machine wherein are supported the usual stack of calender rolls 2, arranged vertically one above the other. Each roll is provided with its individual doctor indicated by the numeral 3. Each doctor compressed into the paper on the next engagement of that portion of the roll with the web being calendered.

Each blade 1 is clamped in suitable aws forming a bar extending parallel wlth the rolls and having trunnions 5 at its ends which are carried by brackets attached to the frame 1, adjacent the roll.

Attached to each blade-supporting bar at one end thereof is a lever 6 whose ree end projects beyond the edge of the frame and to which a downward pressure is applled to hold the doctor blade against the roll. Thls lever is preferably attached to the bar at one end only in order to hold the blade closely against the roll in the manner described in my prior patent above referred to.

The universal control for operating all the doctors comprises a'control rod 7 mounted for vertical adjustment in suitable hangers 8 attached to the frame 1. Each lever is connected to the control rod by means of the independent release mechanism forming the subject-matter of this application, the PI'ENlOllSlY described mechanism being substantially the same as that disclosed in my prior patent.

In my independent release mechanism as shown inthe drawings, an eye-bolt or link is pivoted to the control rod at a point a suitable distance below each doctor lever'6. The eye-bolt 9 is provided with a loose collar 10 slidable thereon, and threaded on the collar is a lever 11 having a lower tubular end surrounding the eye-bolt and provided with a hand grip 12 at its outer end, the lever 11 forming in effect an extension of'the eye-bolt. The extreme end of the eye-bolt is formed with a reduced extension 13 having at its base a short threaded portion to receive a nut 14 forming an abutment for a spring 15 working between the nut 14 and the collar 10, the spring tending normally to press the lever toward the p1vot of the eye-bolt, that is,

' the spring tends to telescope the lever on the eye-bolt.

, The lever 11 is guided at its free end by the extension 13 of the eye-bolt which projects into a suitable bore formed in a web 16 at the end of the tubular portion ofthe lever. Immediately beyond the web 16 the lever is provided with a transverse slot 17 for receiving the end of the doctor lever 6 as shown more particularly in Fig.

2. The upper wall of the slot 17 is pro-' vided with a projection or tooth adapted to engage in a corresponding notch 19 cut into the upper edge of the doctor lever 6. The relative inclination of the sides of the notch and tooth is such that the lever 11 may be withdrawn from the end of the doctor lever without first positively depressing the doctor lever to clear theprojection from engagement with the notch.

purpose which will be later described, the

reduced extension being long enough to project through the web 16 and engage the surface of the lever before the nut 14:.engages the web 16.

It will be understood that the control rod 7 is provided with means whereby it may be raised or lowered to simultaneously throw all the doctors against their rolls or release the doctors from engagement with the rolls, the mechanism selected for illustration being the same as that shown in my prior patent above referred to, comprising a rock shaft 21 extending across the machine frame at right angles to the axes of the calender rolls, the rock shaft being provided with a rock arm pivotally connected to the control rod and with an actuating lever 22 having a latch mechanism whereby the control rod may be locked in either of its positions of adjustment.

The eye-bolts 9 are preferably attached to the control rod by an adjustable connection. As shown, the control rod is made up of two bars fastened together with spacers between them, providing in effect a slot 23, and the pivot pin of each eyebolt is projected through the slot and is clamped to the rod by a nut 24 and collar 25 formed on the pin. This connection is made adjustable so that compression of each individual spring may be initially regulated to secure the desired working pressure of the doctor against the periphery of the roll, and this adjustment should not be altered in the working of the machine unless the wear of the blade or the making of some other repair'ren'ders it necessary.

In operation, after all the springs have been properly adjusted, the doctors will be simultaneously thrown into operation by adjusting the lever 22 to turn the rock shaft and shift the control rod, thereby shifting the parts at each roll to the position shown in' Fig. ,1, If it now be desired, by reason of an accumulation on some one doctor blade or for some other cause, to release the one-individual doctor, the operator has merely to grasp the hand grip 12 of the.

lever 11 and draw the lever off the end of the doctor lever 6, aliowing the operator 'tor lever and the hand lever is necessary to contact with its roll, the outer end of the doctor lever 6 is pulled down until the blade contacts with the roll. This brings the pointed end of the lever in line with the slot 17 so that when the lever 11 is turned over the doctor'lever, the tooth 18 will ride up on the curved upper edge of the doctor lever, compressing the spring 15 to again apply the working pressure to the blade when the tooth reaches the notch. The web 16 is drawn against the nut 14 by the expansion of the spring when the doctor is released, thereby limiting the movement of the lever 11 along the eyebolt so that the slot in the lever 11 will be in proper position to take over the pointed end of the doctor lever when the latch is restored.

As above described, the end of the eye-bolt projects through. the web'16 when the spring 19 expands, the end of the projection being rounded and of sufficient length to engage the under surface of the doctor lever which is curved along an arc struck substantially from the bottom of the notch 19. The purpose of this construction is to hold the notch 19 of the doctor lever 6 against the tooth 18 when the control rod is raised and the tension of the several springs released. By rounding the bottom of the lever the parts may turn freely on the point of the tooth as a center without danger of becoming disengaged. Were this construction not provided, the elevation of the control rod would raise the tooth 18 out of the notch as soon as the tension on the blade was released, thereby allowing the ends of the levers 6 to drop off of the ends of the doctor levers. When the doctors are active the tension of their springs holds the notch and tooth in engagement.

While I have shown my improved doctor control as applied to the construction of my former patent, it will of course be understood that it may be used with equal advantage in other constructions, and that my invention is not limited to the mechanism shown and described except in so far as recited in the appended claims.

I claim:

1. In a calendering machine, the combination of a roll, a pivotally mounted doctor cotiperating therewith, an arm moving with the doctor, a latch engaging the arm and movable to detach it from the arm, a movable member on which the latch is mounted and means for moving said member.

2. In a calendering machine, the combination of a roll, a pivotally mounted doctor cooperating therewith, an arm moving with the doctor, a latch engaging the arm and movable to detach it from the arm, a movable member, means for connectingthe latch to the movable member in various positions of adjustment relatively to the member, and means for moving the member and the latch connected thereto to actuate the arm and doctor.

3. In a calendering machine, the combination of a roll, a pivotally mounted doctor cooperating therewith, an arm moving with the doctor, a movable member, means for moving it, and a latch mounted on the movable member and engaging said arm, the latch being so formed that it positively operates the arm vand the doctor connected thereto when the movable member is moved in either of two opposite directions.

4. In a calendering machine, the combination of a roll, a doctor coacting therewith, an arm moving with the doctor, and means for holding the doctor in coaction with the roll including a detachable latch engaging said arm and consisting of two parts and a spring cooperating with them, one ,of which parts normally engages said arm and the other of which parts may be moved into engagement with the arm. by the spring.

5. In a calendering machine, the combination of a roll, a doctor coacting therewith, an arm moving with the doctor, a detachable latch coacting with the arm and consisting of two parts and a spring cooperating with them, a movable member to which the latch is connected, and means for actuating said member to cause either of the two parts of the latch to operate the arm and doctor.

6. In a calendering machine, the combination of a roll, a pivotally mounted doctor cooperating therewith, an arm moving with the doctor, a movable member, means for moving it, and a latch mounted on the movable member and consisting of two parts and a spring cooperating with them, one of which parts normally engages said arm to hold the doctor in contact with the roll and the other of which parts may be moved into engagement with the arm by movement of the member on which the latch is mounted.

7 In a calendering machine, the combination of a roll, a pivotally mounted doctor cooperating therewith, an arm moving with the doctor, a movable member, means for moving it, and a latch mounted on the movable member and engaging said arm, the latch consisting of two parts and a spring cooperating with them, one of which parts normally engages the arm to hold the doctor against the rolls and the other of which parts is carried into engagement with the arm by the movement of said member.

8. In a calendering machine, the combination of a roll, a doctor, an arm moving with the doctor, and means for holding the doctor against the roll including a detachable latch consisting of two parts and a spring cooperating with them, said latch having two surfaces thereon, one on one of said parts and the other on the other part between which surfaces the arm extends when the latch is in latching position and which surfaces are normally spaced apart a distance greater than the width of the portion of the arm cooperating therewith.

9. In a calendering machine comprising a stack of rolls, a set of doctors for a plural- -ity of said rolls, means for simultaneously disturbing the adjustment of any other doctor.

10. In a calenderingmachine comprising a stack of rolls, a set of doctors for a plurality of said rolls, a common control for said doctors comprising a shiftable member, and connections between said doctors and said member, certain of said connections consisting of quickly detachable latches whereby an individual doctor may be released from contact with its roll without disturbing the position of-the other doctors.

11. In a calendering machine embodying a stack of rolls, a set of doctors for a plurality of 'said rolls, means for simultaneously shifting said doctors toward and away from their respective rolls comprising a common control member, and connections between each doctor and said member, each of said connections comprising a spring for maintaining its doctor yieldingly against the roll when the member is in one position of adjustment, said connections also embodying a latch having its parts held in engagement by said spring whereby an in- 'dividual doctor may be released from contact with its roll.

12. In a calendering machine embodying a stack of rolls, a set of doctors for a plumaintaining its doctor yieldingly against the roll when the member is in one position of adjustment, said connections also embodying a latch having its parts held in engagement by said spring whereby an individual doctor may be released from contact with its roll, said spring being arranged to hold said parts in latching engagement when the control member is shifted to relieve the compression of the doctors against their rolls.

13. In a calendering machine embodying a stack of rolls, a set of doctors for a plurality of said rolls, each doctor comprising a blade mounted for pivotal movement, an arm connected to said blade, a common control member for shifting said doctors to ward and away from their respectiverolls, and connections between the arm of each of said doctors and said member, said connections comprising links pivotally connected to said member, each link consisting of two parts longitudinally extensible with relation to each other, and a spring for drawing said parts together, and the outer partof each link having a shoulder adapted to engage over the arm of its doctor when said spring is under tension.

14. In a calendering machine, the combination of a plurality of rolls, a pivotally mounted doctor for each roll, a laterally-extending arm on each doctor, a control-rod extending adjacent to-all of said arms, and a plurality of connecting members each pivotally mounted on the control-rod adjacent to one of the arms and adapted to be turned on its pivot to carry it into and out of engagement with its corresponding arm.

15. In a calendering machine, the combination of a plurality of rolls, a pivotally mounted doctor for each roll, a laterally-extending arm on each doctor, a control-rod extending adjacent to all of said arms, and a plurality of connecting members each pivotally mounted on the control-rod adjacent to one of the arms and adapted to be turned on its pivot to carry it into and out of engagement with its corresponding arm, each of said members consisting of two telescopic parts and a spring between the two parts.

16. In a calendering machine, the combination of a stack of parallel rolls, a pivotally mounted doctor for each roll, a lateral arm on each doctor, a control-rod adjacent to all of said arms and movable parallel to V the stack of rolls to either of two positions, and a plurality of connecting members each pivotally mounted on the control-rod adjacent to one of the arms and adapted to be turned on its pivot to carry it into and out of engagement with its corresponding arm, said connections being adapted to positively operate said arms when the control-rod is moved from either of its two positions to the other position.-

In testimony whereof I affix my signature. 

